Daniel clued me in to the great offerings of Just Another Foundry - a type foundry who not only has a great selection of faces but also has a novel approach to presenting them on the web. Instead of just purchasing the font file for your Library they also offer a "Subscription" service that allows you to embed the font on any pre-determined domain for a year. Basically, a web license for the type built right into the shopping cart. I've not seen anyone do this before but imagine it will become standard practice.